Im gonna pick up a plain rear sight, just want to make sure i dont buy the wrong one. I measured the current one at .375", which means i should get the extra tall one....right? http://www.10-8performance.com/products/1911-Low-Mount-Rear-Sight.html Also, i was gonna have a local 'smith install this, as well as a wilson short trigger for me. This is a pretty simple job, correct? I dont want this guy butchering my gun. He said its easy, and ive read its simple. Thanks in advance.